Techniques for Estimating the Longevity of Lime-Treated Expansive Clays

Two techniques are presented that investigate the possibility of estimating the longevity of lime-treated expansive clays subjected to leaching. The techniques are based on analyzing calcium concentrations and pH changes within accelerated leached laboratory specimens and their leachates during the leaching process. The accelerated leach times required to produce specific calcium concentrations and pH in the laboratory are converted to actual field leaching (or percolation) times by using developed time scale factors.

The techniques are tested for validity by correlating estimated calcium concentrations and pH values of field lime-treated clays to the actual results of field lime-treated clay layers of various known ages. The correlations showed that pH estimations were within an average of 13% of measured values, while estimated calcium concentrations remaining in the soil-lime layers were within an average of 18% of measured values

An investigation of groundwater contamination around the Likeng landfill, Guangzhou, was carried out. Major ions and elements of 34 groundwater samples were measured, and the Piper trilinear diagram and expanded Durov diagram were used to analyze the chemical types and hydro-geochemical processes of the groundwater. End Member Mixing Analysis was used to find the types and sources of pollutants. The results show that the hydro-geochemical process was mainly mixing and ion exchange; the shallow groundwater around...

This article aims to evaluate membrane contactors capability to remove and recover ammonia from landfill leachate (LFL). A hydrophobic hollow fiber membrane module was used to achieve such purpose. A sulfuric acid diluted solution was used as extraction solution to speed up ammonia content removal. Several factors that have influence on ammonia removal and recovery capability such as ammonia solution pH, concentration of sulfuric acid solutions and flow rate of liquid phases have been examined. Microfiltration...

Project referenceProject:Pilot project in Ersmarksdeponin landfill in Umeå countyCustomer:Umeå county, SwedenProject period1999Nature of task:Development of new monitoring strategy for landfill:
Time integrated monitoring of bioavailable fraction of PAH and PCB in landfill leachate (surface water and groundwater);
In-situ monitoring of free metals;
Monitoring of accute leachate toxicity;
Monitoring of TOC and physical parameters of leachate
SummaryThe content of leachate from municipal...

Chitosan was chosen as an alternative primary coagulant in a complementary coagulation–flocculation treatment of sanitary landfill leachate with the aim of removing recalcitrant organic matter. In order to optimize the process conditions, central composite design and response surface methodology were applied. To evaluate the performance of the process using chitosan, we also carried out tests with aluminium sulphate (Al2 (SO4)3.14 H2O) as coagulant. In addition, acute toxicity tests were carried using the...

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